1
GATE EE 2006
MCQ (Single Correct Answer)
+2
-0.6
A $$300$$ $$kVA$$ transformer has $$95\% $$ efficiency at full load $$0.8$$ $$pf$$ lagging and $$96\% $$ efficiency at half load, unity $$pf.$$

What is the maximum efficiency (in %) at unity $$pf$$ load?

A
$$95.1$$
B
$$96.2$$
C
$$96.4$$
D
$$98.1$$
2
GATE EE 2004
MCQ (Single Correct Answer)
+2
-0.6
The resistance and reactance of a 100 kVA 11000|400 V, $$\triangle$$ - Y distribution transformer are 0.02 and 0.07 pu respectively. The phase impedance of the transformer referred to the primary is
A
(0.02 + j0.07) Ω
B
(0.55 + j1.925) Ω
C
(15.125 + j52.94) Ω
D
(72.6 + j254.1) Ω
3
GATE EE 2004
MCQ (Single Correct Answer)
+2
-0.6
A 500 kVA, 3-phase transformer has iron loses of 300 W and full load copper losses of 600 W. The percentage load at which the transformer is expected to have maximum efficiency is
A
50.0%
B
70.7%
C
141.4%
D
200.0%
4
GATE EE 2004
MCQ (Single Correct Answer)
+2
-0.6
A 50 kVA, 3300/230 V single-phase transformers is connected as an autotransformer shown in figure. The nominal rating of the autotransformer will be GATE EE 2004 Electrical Machines - Transformers Question 54 English
A
50.0 kVA
B
53.5 kVA
C
717.4 kVA
D
767.4 kVA
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